测试环境说明:Python版本是 3.8.10 ,DBUtils版本是3.1.0 ,pymysql版本是1.0.3
- 首先安装指定版本的连接池库DBUtils 、还有pymysql
python
pip install DBUtils==3.1.0
pip install pymysql==1.0.3
- 创建文件 sqlConfig.py
python
# sqlConfig.py
import pymysql
from dbutils.pooled_db import PooledDB
# 有些版本使用下面语句引入,要注意一下
# from DBUtils.PooledDB import PooledDB
host = '127.0.0.1'
port = 3306
user = 'myname'
password = 'mypass'
database = 'contest'
class MySQLConnectionPool:
def __init__(self,):
self.pool = PooledDB(
creator=pymysql, # 使用链接数据库的模块
mincached=10, # 初始化时,链接池中至少创建的链接,0表示不创建
maxconnections=200, # 连接池允许的最大连接数,0和None表示不限制连接数
blocking=True, # 连接池中如果没有可用连接后,是否阻塞等待。True,等待;False,不等待然后报错
host=host,
port=port,
user=user,
password=password,
database=database
)
def open(self):
self.conn = self.pool.connection()
self.cursor = self.conn.cursor(cursor=pymysql.cursors.DictCursor) # 表示读取的数据为字典类型
return self.conn, self.cursor
def close(self, cursor, conn):
cursor.close()
conn.close()
def select_one(self, sql, *args):
"""查询单条数据"""
conn, cursor = self.open()
cursor.execute(sql, args)
result = cursor.fetchone()
self.close(conn, cursor)
return result
def select_all(self, sql, args):
"""查询多条数据"""
conn, cursor = self.open()
cursor.execute(sql, args)
result = cursor.fetchall()
self.close(conn, cursor)
return result
def insert_one(self, sql, args):
"""插入单条数据"""
self.execute(sql, args, isNeed=True)
def insert_all(self, sql, datas):
"""插入多条批量插入"""
conn, cursor = self.open()
try:
cursor.executemany(sql, datas)
conn.commit()
return {'result': True, 'id': int(cursor.lastrowid)}
except Exception as err:
conn.rollback()
return {'result': False, 'err': err}
def update_one(self, sql, args):
"""更新数据"""
self.execute(sql, args, isNeed=True)
def delete_one(self, sql, *args):
"""删除数据"""
self.execute(sql, args, isNeed=True)
def execute(self, sql, args, isNeed=False):
"""
执行
:param isNeed 是否需要回滚
"""
conn, cursor = self.open()
if isNeed:
try:
cursor.execute(sql, args)
conn.commit()
except:
conn.rollback()
else:
cursor.execute(sql, args)
conn.commit()
self.close(conn, cursor)
- 创建文件 sqlTest.py ,并引入sqlConfig.py使用
python
# sqlTest.py
# 引入连接池类
from sqlConfig import MySQLConnectionPool
# 创建连接池对象
ConnPool = MySQLConnectionPool()
# 模糊查询
strSelectAll = "select * from names where name like %s"
results = ConnPool.select_all(strSelectAll, ('%唐%',))
print(results)
# 精确查询
# strSelectAll = "select * from names where name=%s"
# results = ConnPool.select_all(strSelectAll, ('唐三',))
# print(results)
# 单条查询
# strSelectOne = 'select * from `names` where `name`=%s'
# results = ConnPool.select_one(strSelectOne, ('唐三',))
# print(results)
# 单条插入
# strInsertOne = "insert into `names` (`name`, sex, age) values (%s,%s,%s)"
# ConnPool.insert_one(strInsertOne, ('唐三', '男', 22))
# 批量插入
# datas = [
# ('戴沐白', '男', 26),
# ('奥斯卡', '男', 26),
# ('唐三', '男', 25),
# ('小舞', '女', 100000),
# ('马红俊', '男', 23),
# ('宁荣荣', '女', 22),
# ('朱竹清', '女', 21),
# ]
# sql_insert_all = "insert into `names` (`name`, sex, age) values (%s,%s,%s)"
# ConnPool.insert_all(sql_insert_all, datas)
# sql_update_one = "update `names` set age=%s where `name`=%s"
# ConnPool.update_one(sql_update_one, (28, '唐三'))
# sql_delete_one = 'delete from `names` where `name`=%s '
# ConnPool.delete_one(sql_delete_one, ('唐三',))
运行代码